Fixed compilation errors and warnings with GCC 4.7

Also, since GCC 4.7 there is a binary compatibility issue when linking with a
Guichan that was not compiled in C++11 mode. This commit also allows compiling
with GCC 4.7 with C++11 mode turned off.

Reviewed-by: Erik Schilling

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gui/widgets/textfield.h b/src/gui/widgets/textfield.h
index 28654032..94cada41 100644
--- a/src/gui/widgets/textfield.h
+++ b/src/gui/widgets/textfield.h
@@ -63,6 +63,7 @@ struct TextHistory {
 
 class AutoCompleteLister {
 public:
+    virtual ~AutoCompleteLister() {}
     virtual void getAutoCompleteList(std::vector<std::string>&) const {}
 };